Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > TPI
Register Forgot Password?

TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by South Bay Fuel Injectors
Click Here

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 12-27-2002, 05:57 PM   #1
Member
 
Join Date: Jan 2002
Location: New Brighton, MN
Posts: 374

Classifieds Rating: (0)

What Are Specs For 85 TPI 305 Cam? Will 1.6 Rockers Benefit This Cam?

The 85 TPI 305's had a fairly good cam from GM. 86 and later, the dreaded "peanut cam" entered the picture, with the result of a 25 hp drop. Anyone know the specs of the 85 TPI cam? I've been told that its literally the same cam as the "L69", which I believe is from the 305 H.O. of the previous year. Anyone know how this cam compares to the "L98" cam used in the later 80's into the 90's on both the 305/350 TPI's. I do know that the "L98" cam IS a roller cam, and the 85 TPI was NOT a roller cam engine. But i'm curious if the lift/duration/etc are similar. Comments?

As a side note, G.M. seemed to go out of their way using many different cam grinds for their small blocks, especially in this period(peanut cam, L69, L98, TBI cams,etc). Seems for both TBI, and TPI engines, one or two of the hotter cam grinds would have worked well across the board, made them ALL perform a bit better against the 'Stangs, and been cheaper to manufacture, needing less part##, inventories, etc, to manufacture. Its usually cheaper and more efficient to commonize parts for mass production. Just a thought.
__________________
1985 Iroc, 305 TPI, L69 cam (non-peanut), 700R4, Vette servo, S-10 torque converter, B&M tranny cooler, 3:42 posi, AFPR 48 lbs, base timing 11*, 92 octane, T-body bypass, Airfoil, K&N's, MAF descreened, ported & siamesed plenum, ported TPIS Big Mouth base, ported & polished '416's w/ 3 angle valve job & backcut valves, Comp 1.6 rockers, Hooker 2460's w/ 3-in Y-pipe, ported cat, Heartthrob HVS 3-in System, TPIS wires, backcut & indexed AC R43TS plugs gapped @ .043, cleaned & flow matched injectors, Mobil 1

1991 305, World Class T- 5, McLeod Clutch, Converter Delete , Hooker 1 5/8 Headers and Y-Pipe, Heartthrob 3" Exhaust, Vortecs milled to 56cc's, Comp 981 Springs, LT1 Cam, 1.6 Comp Rockers, Ultimate TBI mods, Bumped FP, .75" intake spacer, Injector Pod Spacer, Mobil 1, Edelbrock Performer RPM Air Gap Intake, BFG G Force T/A's, Eibach Sportline Springs

Last edited by 1991 RS 305; 12-28-2002 at 11:05 AM.
1991 RS 305 is offline vBGarage Page   Reply With Quote
Old 12-27-2002, 06:50 PM   #2
Senior Member
 
Drew's Avatar
 
Join Date: Jul 1999
Posts: 12,324

Classifieds Rating: (14)
From what I have read, the L69, 85 LB9, 87 L98 cams all are the same, the only difference is the 87 is a roller cam.
Drew is offline vBGarage Page   Reply With Quote
Old 12-27-2002, 07:21 PM   #3
Junior Member
 
Join Date: Feb 2002
Location: Coops, mi
Posts: 16

Classifieds Rating: (0)
I am would also like to know

I have a 305 TPI so I would also like to know how good this cam is as compared to the other years.
85transam1 is offline vBGarage Page   Reply With Quote
Old 12-28-2002, 12:26 AM   #4
Junior Member
 
Join Date: Nov 2002
Location: Surrey, BC
Posts: 54
Car: 1989 GTA
Engine: L98 350, dual cats
Transmission: 700R-4

Classifieds Rating: (0)
Drew hit it bang on the money.

All 1986 TPI engines got the peanut cam regardless of manual or auto trans. 1986 was truly a dreadful year for the cam situation, as that was when federal emmissions changes took effect and near as I understand it, GM went conservative with the cam that year so they would have no problems with passing the EPA requirements with the Tuned Port 305 engines. Thankfully, it was a 1 year only deal, and subsequent years saw the cams for the 5-speed TPI and L98 engines get better, with the best cams coming in 1988-89. The auto trans TPI 305's however, were saddled with peanut roller cam for the rest of their days beginning in 1987 and ending in 1992.

Back to 1985, and as Drew pointed out, the L69 cam went into the new for '85 TPI 305 also. Those are pretty good engines in stock form, making good power for back in the day.

Dave
__________________
1989 GTA L98
Gunmetal metallic, L98, all performance options...
The Anvil is offline vBGarage Page   Reply With Quote
Old 12-28-2002, 07:28 AM   #5
Supreme Member
 
Join Date: Aug 2001
Location: British Columbia
Posts: 1,579
Car: 90 IROC 5.7 hardtop
Engine: L98
Transmission: T5 swap
Axle/Gears: Yup -- they still work

Classifieds Rating: (1)

I'll have to double check... but I think the '85 TPI cam was 202/206 @ .050 and .403/415 lift.

The flat tappet L69 HO cam was 203/209 @ .050 and .410/.423 lift.

RP.
__________________
1990 IROC 5.7 hardtop
palric is offline vBGarage Page   Reply With Quote
Old 12-28-2002, 10:11 AM   #6
Member
 
Join Date: Jan 2002
Location: New Brighton, MN
Posts: 374

Classifieds Rating: (0)

O.K., so the 85 305 fortunately got a decent cam stock. Now, I, like many people no doubt, am wondering if 1.6 ratio rockers would work well with this cam? Would it require new springs, pushrods, etc? Do they need to be "self-aligning"? Full roller or roller-tip? How 'bout clearing the valve covers? New valve seals? I am not too familiar with this aspect of things, so any comments or input would be appreciated. Thanks in advance.
__________________
1985 Iroc, 305 TPI, L69 cam (non-peanut), 700R4, Vette servo, S-10 torque converter, B&M tranny cooler, 3:42 posi, AFPR 48 lbs, base timing 11*, 92 octane, T-body bypass, Airfoil, K&N's, MAF descreened, ported & siamesed plenum, ported TPIS Big Mouth base, ported & polished '416's w/ 3 angle valve job & backcut valves, Comp 1.6 rockers, Hooker 2460's w/ 3-in Y-pipe, ported cat, Heartthrob HVS 3-in System, TPIS wires, backcut & indexed AC R43TS plugs gapped @ .043, cleaned & flow matched injectors, Mobil 1

1991 305, World Class T- 5, McLeod Clutch, Converter Delete , Hooker 1 5/8 Headers and Y-Pipe, Heartthrob 3" Exhaust, Vortecs milled to 56cc's, Comp 981 Springs, LT1 Cam, 1.6 Comp Rockers, Ultimate TBI mods, Bumped FP, .75" intake spacer, Injector Pod Spacer, Mobil 1, Edelbrock Performer RPM Air Gap Intake, BFG G Force T/A's, Eibach Sportline Springs

Last edited by 1991 RS 305; 12-28-2002 at 10:33 AM.
1991 RS 305 is offline vBGarage Page   Reply With Quote
Old 12-28-2002, 01:04 PM   #7
Suspended
 
Join Date: Jul 1999
Location: Other side of the paper fence
Posts: 10,197
Car: Race car
Engine: Internal Combustion
Transmission: Static

Classifieds Rating: (1)
The L69 and 85 TPI cams are exactly the same, the specs are not different. The GM PN is the same.

86 L69's dont have a peanut cam.
madmax is offline vBGarage Page   Reply With Quote
Old 12-30-2002, 05:30 PM   #8
Supreme Member
 
Join Date: Aug 2001
Location: British Columbia
Posts: 1,579
Car: 90 IROC 5.7 hardtop
Engine: L98
Transmission: T5 swap
Axle/Gears: Yup -- they still work

Classifieds Rating: (1)

Quote:
Originally posted by 1991 RS 305
O.K., so the 85 305 fortunately got a decent cam stock. Now, I, like many people no doubt, am wondering if 1.6 ratio rockers would work well with this cam? Would it require new springs, pushrods, etc? Do they need to be "self-aligning"? Full roller or roller-tip? How 'bout clearing the valve covers? New valve seals? I am not too familiar with this aspect of things, so any comments or input would be appreciated. Thanks in advance.
Well the TPI and the L69 did. Everything else did much poorer. 1.6s will work with any stock 3rd gen cam that I know of. I think '87 and up needed self aligning units. Push rods and springs are cheap I'd go with a new set of either.

my .02 cents worth,
RP.
__________________
1990 IROC 5.7 hardtop
palric is offline vBGarage Page   Reply With Quote
Old 12-30-2002, 07:12 PM   #9
Moderator
 
Jim85IROC's Avatar
 
Join Date: Jul 1999
Location: Readsboro, VT
Posts: 13,555
Car: 85 IROC-Z / 88 GTA
Engine: 403 LSx (Pending) / 355 Tuned Port
Transmission: T56 Magnum (Pending) / T5
Axle/Gears: 3.42 / ?

Classifieds Rating: (2)

Send a message via AIM to Jim85IROC
1985 (L69 & LB9)
Duration @ 50: 202/206
Lift (1.5): 403/415
LSA: 114.5
GM Part #14088843

1986 (LB9)
Duration @ 50: 178/194
Lift (1.5): 350/385
LSA: 109.0
GM Part #14094097

1987 (LB9 5-Speed, L98)
Duration @ 50: 202/207
Lift (1.5): 404/415
LSA: 114.5
GM Part #10088155

1988 & 89 (LB9 5 speed, L98)
Duration @ 50: 207/213
Lift (1.5): 415/430
LSA: 117.0
GM Part #10066049

1990 (305 5-speed w/G92 & 350)
Duration @ 50: 202/207
Lift (1.5): 413/428
LSA: 114.5
GM Part #10111773

My buddy replaced the cam in his 86 LB9 TA (*** only knows why), and what did he replace it with? Another stock 86 LB9 cam.
__________________

My Cardomain Site
Jim85IROC is offline vBGarage Page   Reply With Quote
Old 12-30-2002, 07:21 PM   #10
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,595
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
Quote:
Originally posted by 1991 RS 305
Anyone know the specs of the 85 TPI cam? I've been told that its literally the same cam as the "L69", which I believe is from the 305 H.O. of the previous year.
the L69 (305 H.O) was produced in 83-85, and I thought there were a handful in 1986.



Quote:
Originally posted by The Anvil
All 1986 TPI engines got the peanut cam regardless of manual or auto trans.
I didn't think there was a 1986 manual TPI 305 combination certified and sold.



Quote:
Originally posted by 1991 RS 305
O.K., so the 85 305 fortunately got a decent cam stock. Now, I, like many people no doubt, am wondering if 1.6 ratio rockers would work well with this cam?
They will work fine with it.

Quote:
Would it require new springs, pushrods, etc? Do they need to be "self-aligning"? Full roller or roller-tip? How 'bout clearing the valve covers? New valve seals?
Since the 85 LB9 had iron heads, you do not need, nor want to run self-aligning rockers with it's stock heads, pushrods, etc. Seals are always a good idea if you have the heads partially apart like that. Go full roller if you can swing it. There are tonnes of rocker covers to fit the 85 heads w/ clearance for the rockers if the stock ones don't do it.
__________________
86 SS, lotsa mods
If you need a PN in a hurry so you can order it and wait 10 days for it to get there instead of buying it locally, you're not in that big of a hurry.
jmd is offline vBGarage Page   Reply With Quote
Old 12-30-2002, 10:20 PM   #11
Supreme Member
 
Join Date: Feb 2000
Location: Winston salem, NC
Posts: 2,850
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's

Classifieds Rating: (4)

Did the 87 Auto 305 HO motors come with the so called "peanut cam" The 87 has roller rockers? So it would be a good idea to change the cam in my engine? thanks
__________________
1987 White IROC-Z/T's
auto 3.42's SLP Zexel
10:70 scr 8:9 dcr Retro 4bolt 385 MAF Stroker!
StealthRam, AFR Eliminator 195's, 7cc KB flat tops, 226/232 559/565 custom Cam w/1.6 promags, ALL CC retro Valvetrain, 58mmTB, 30lb SVO's, Digi6 box, ALL MSD ignition, 3400 stall, 1 3/4 Hooker SuperComps coated, 3"ORY, Wide open Borla, !CAT,!AC, KYB AGX's, MAC SFC's, BBK Underdrives, LS1 DS, BMR relo brackets, BMR LCA's, BMR adj TA, Spohn adj PHB...100 NX Wet Kit with ALL the options
**3411lbs with driver 1/4 tank** no bottle
Wishmaster's87IROC is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 10:16 AM   #12
Moderator
 
Jim85IROC's Avatar
 
Join Date: Jul 1999
Location: Readsboro, VT
Posts: 13,555
Car: 85 IROC-Z / 88 GTA
Engine: 403 LSx (Pending) / 355 Tuned Port
Transmission: T56 Magnum (Pending) / T5
Axle/Gears: 3.42 / ?

Classifieds Rating: (2)

Send a message via AIM to Jim85IROC
Yes, the 87 305 autos still had a peanut cam. They used the following cam:

1987 (LB9 Auto)
Duration @ 50: 179/194
Lift (1.5): 350/384
LSA: 109.0
GM Part #14094097

1988-90 (LB9 Auto)
Duration @ 50: 179/194
Lift (1.5): 350/384
LSA: 109.0
GM Part #10088155

I'm not sure what's different about the 88-90 cam, but it's got a different part number. The ramp profile may be different.
__________________

My Cardomain Site
Jim85IROC is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 10:35 AM   #13
Supreme Member
 
Join Date: Feb 2000
Location: Winston salem, NC
Posts: 2,850
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's

Classifieds Rating: (4)

Is the 87 TPI 305 and the TPI 305HO the same motor? is so then why did they add the "HO" which I know mean High Output. but why did they refer to this motor as such?
Is it positive that the 87 305HO came with the peanut cam? So putting any other cam better would make a big improvement?


thanks
Wishmaster's87IROC is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 02:55 PM   #14
Junior Member
 
Join Date: Nov 2002
Location: Surrey, BC
Posts: 54
Car: 1989 GTA
Engine: L98 350, dual cats
Transmission: 700R-4

Classifieds Rating: (0)
No the HO is *not* the TPI 305. The HO is the carbed L-69 (High Output), which never got the peanut cam.

Dave
__________________
1989 GTA L98
Gunmetal metallic, L98, all performance options...
The Anvil is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 02:58 PM   #15
Junior Member
 
Join Date: Nov 2002
Location: Surrey, BC
Posts: 54
Car: 1989 GTA
Engine: L98 350, dual cats
Transmission: 700R-4

Classifieds Rating: (0)
Quote:
Since the 85 LB9 had iron heads, you do not need, nor want to run self-aligning rockers with it's stock heads
Self-aligning rockers have nothing to do with whether or not the heads are iron or aluminum; rather it has to do with whether or not the engine was originally equipped with a roller-cam or not. Since 1985 still used a flat-tappet cam, in this case no, you do not need the self-aligning rockers.

Just a clarification.

Dave
__________________
1989 GTA L98
Gunmetal metallic, L98, all performance options...
The Anvil is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 03:20 PM   #16
Supreme Member
 
Join Date: Feb 2000
Location: Winston salem, NC
Posts: 2,850
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's

Classifieds Rating: (4)

Well then how come when I pulled my VIn# on Carfax it says HO and also some people that Ive talked say I have an HO motor. ITs a TPI too. Like one guy that used to work at the Chevy place years ago and did some work on my car. He says told me a bunch of reason that I have an HO motor and he used to have an IROC back in the day when they came out. Bought it dirt cheap thru Chevy, cause he was an employer... Ive heard a bunch of people talk about HO and never said that they just came out in "carbed" cars.
Wishmaster's87IROC is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 03:39 PM   #17
Moderator
 
Jim85IROC's Avatar
 
Join Date: Jul 1999
Location: Readsboro, VT
Posts: 13,555
Car: 85 IROC-Z / 88 GTA
Engine: 403 LSx (Pending) / 355 Tuned Port
Transmission: T56 Magnum (Pending) / T5
Axle/Gears: 3.42 / ?

Classifieds Rating: (2)

Send a message via AIM to Jim85IROC
Because we all know that Carfax is the most accurate resource for thirdgen information.

In a lot of cases, all TPI motors were referred to as "HO" motors, because compared to the LG4s, they were. Officially, the only motor to get the HO designation was the L69.
__________________

My Cardomain Site
Jim85IROC is offline vBGarage Page   Reply With Quote
Old 12-31-2002, 11:10 PM   #18
Junior Member
 
Join Date: Nov 2002
Location: Surrey, BC
Posts: 54
Car: 1989 GTA
Engine: L98 350, dual cats
Transmission: 700R-4

Classifieds Rating: (0)
Jim, you took the words right out of my mouth.

Dave
__________________
1989 GTA L98
Gunmetal metallic, L98, all performance options...
The Anvil is offline vBGarage Page   Reply With Quote
Old 01-01-2003, 03:56 PM   #19
Suspended
 
Join Date: Jul 1999
Location: Other side of the paper fence
Posts: 10,197
Car: Race car
Engine: Internal Combustion
Transmission: Static

Classifieds Rating: (1)
Quote:
Originally posted by The Anvil
Self-aligning rockers have nothing to do with whether or not the heads are iron or aluminum; rather it has to do with whether or not the engine was originally equipped with a roller-cam or not. Since 1985 still used a flat-tappet cam, in this case no, you do not need the self-aligning rockers.

Just a clarification.

Dave
Thats not even true. 87's dont have self aligning rockers, but do have a roller cam. The only sure fire way is to look at the head.
madmax is offline vBGarage Page   Reply With Quote
Old 01-01-2003, 04:17 PM   #20
Supreme Member
 
Join Date: Feb 2000
Location: Winston salem, NC
Posts: 2,850
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's

Classifieds Rating: (4)

Im just rying to figure out which higher/better cam I can use without changing anything esle. I just want to be able to slid the old cam out and put the new cam in....is that possible?
Wishmaster's87IROC is offline vBGarage Page   Reply With Quote
Old 01-01-2003, 05:51 PM   #21
Junior Member
 
Join Date: Nov 2002
Location: Surrey, BC
Posts: 54
Car: 1989 GTA
Engine: L98 350, dual cats
Transmission: 700R-4

Classifieds Rating: (0)
Quote:
Originally posted by madmax
Thats not even true. 87's dont have self aligning rockers, but do have a roller cam. The only sure fire way is to look at the head.
Then what years exactly, came with the self-aligning rockers, and in which applications?

Dave
The Anvil is offline vBGarage Page   Reply With Quote
Old 01-02-2003, 11:24 PM   #22
Suspended
 
Join Date: Jul 1999
Location: Other side of the paper fence
Posts: 10,197
Car: Race car
Engine: Internal Combustion
Transmission: Static

Classifieds Rating: (1)
Well, supposedly GM used them on anything SBC 88 and newer. Given GM's consistency, I will not call that a hard and fast rule, but there werent any in 87. At least not any from GM. Someone could always have swapped some in later (and stuff like that happens all the time).
madmax is offline vBGarage Page   Reply With Quote
Old 01-02-2003, 11:24 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > TPI

Tags
16, 1985, 305, 92, cam, camshaft, chevy, gm, l69, lb9, port, ratio, rockers, specs, tpi, tuned
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 05:09 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details